CN117946185A - Catalyst containing large-volume diimine nickel and preparation method and application thereof - Google Patents
Catalyst containing large-volume diimine nickel and preparation method and application thereof Download PDFInfo
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- CN117946185A CN117946185A CN202211334790.8A CN202211334790A CN117946185A CN 117946185 A CN117946185 A CN 117946185A CN 202211334790 A CN202211334790 A CN 202211334790A CN 117946185 A CN117946185 A CN 117946185A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000003054 catalyst Substances 0.000 title claims abstract description 47
- 229910000071 diazene Inorganic materials 0.000 title claims abstract description 31
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 30
- RAABOESOVLLHRU-UHFFFAOYSA-N diazene Chemical compound N=N RAABOESOVLLHRU-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000005977 Ethylene Substances 0.000 claims abstract description 41
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 32
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004698 Polyethylene Substances 0.000 claims abstract description 16
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 13
- 239000000178 monomer Substances 0.000 claims abstract description 13
- -1 polyethylene Polymers 0.000 claims abstract description 10
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- 229920001577 copolymer Polymers 0.000 claims abstract description 7
- 229920000573 polyethylene Polymers 0.000 claims abstract description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 93
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 68
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 55
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 45
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 238000001035 drying Methods 0.000 claims description 39
- 239000002904 solvent Substances 0.000 claims description 30
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 28
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims description 28
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 21
- 239000000706 filtrate Substances 0.000 claims description 20
- 239000000047 product Substances 0.000 claims description 20
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 20
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 18
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 18
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 15
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 15
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 claims description 14
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 14
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 14
- 238000004440 column chromatography Methods 0.000 claims description 13
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 13
- AFPRJLBZLPBTPZ-UHFFFAOYSA-N acenaphthoquinone Chemical group C1=CC(C(C2=O)=O)=C3C2=CC=CC3=C1 AFPRJLBZLPBTPZ-UHFFFAOYSA-N 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 11
- 238000003786 synthesis reaction Methods 0.000 claims description 11
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 10
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 10
- 235000005074 zinc chloride Nutrition 0.000 claims description 10
- 239000011592 zinc chloride Substances 0.000 claims description 10
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 7
- 125000001424 substituent group Chemical group 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- GZFGOTFRPZRKDS-UHFFFAOYSA-N 4-bromophenol Chemical compound OC1=CC=C(Br)C=C1 GZFGOTFRPZRKDS-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- IRXRGVFLQOSHOH-UHFFFAOYSA-L dipotassium;oxalate Chemical compound [K+].[K+].[O-]C(=O)C([O-])=O IRXRGVFLQOSHOH-UHFFFAOYSA-L 0.000 claims description 5
- VVWRJUBEIPHGQF-UHFFFAOYSA-N propan-2-yl n-propan-2-yloxycarbonyliminocarbamate Chemical compound CC(C)OC(=O)N=NC(=O)OC(C)C VVWRJUBEIPHGQF-UHFFFAOYSA-N 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 125000003944 tolyl group Chemical group 0.000 claims description 4
- 239000004705 High-molecular-weight polyethylene Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- OJPSFJLSZZTSDF-UHFFFAOYSA-N 3-ethoxyprop-1-ene Chemical compound CCOCC=C OJPSFJLSZZTSDF-UHFFFAOYSA-N 0.000 claims description 2
- BLMIXWDJHNJWDT-UHFFFAOYSA-N 6-chlorohex-1-ene Chemical compound ClCCCCC=C BLMIXWDJHNJWDT-UHFFFAOYSA-N 0.000 claims description 2
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 claims description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000013375 chromatographic separation Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 claims description 2
- 229930015698 phenylpropene Natural products 0.000 claims description 2
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- LFRDHGNFBLIJIY-UHFFFAOYSA-N trimethoxy(prop-2-enyl)silane Chemical compound CO[Si](OC)(OC)CC=C LFRDHGNFBLIJIY-UHFFFAOYSA-N 0.000 claims description 2
- 229940075466 undecylenate Drugs 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 4
- 230000000694 effects Effects 0.000 abstract description 12
- 229920000642 polymer Polymers 0.000 abstract description 10
- 150000001336 alkenes Chemical class 0.000 abstract description 7
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 abstract description 7
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000006467 substitution reaction Methods 0.000 abstract 1
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 48
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 12
- 238000005160 1H NMR spectroscopy Methods 0.000 description 12
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 8
- OTXINXDGSUFPNU-UHFFFAOYSA-N 4-tert-butylbenzaldehyde Chemical compound CC(C)(C)C1=CC=C(C=O)C=C1 OTXINXDGSUFPNU-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 229920000098 polyolefin Polymers 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000921 elemental analysis Methods 0.000 description 3
- 239000003446 ligand Substances 0.000 description 3
- BHAAPTBBJKJZER-UHFFFAOYSA-N p-anisidine Chemical compound COC1=CC=C(N)C=C1 BHAAPTBBJKJZER-UHFFFAOYSA-N 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- RELMFMZEBKVZJC-UHFFFAOYSA-N 1,2,3-trichlorobenzene Chemical compound ClC1=CC=CC(Cl)=C1Cl RELMFMZEBKVZJC-UHFFFAOYSA-N 0.000 description 2
- QSJXEFYPDANLFS-UHFFFAOYSA-N Diacetyl Chemical compound CC(=O)C(C)=O QSJXEFYPDANLFS-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000000113 differential scanning calorimetry Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 1
- 239000005043 ethylene-methyl acrylate Substances 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a preparation method of a large-volume alpha-diimine nickel catalyst containing different substitutions and application of the catalyst in preparing polyethylene and ethylene/methyl acrylate copolymer; different substituted ortho-diaryl groups are introduced into a diimine nickel system, a metal nickel center pair is effectively protected by utilizing space effect, and the polymerization capacity of the catalyst is regulated by further utilizing different substituted electronic effect. The synthesized nickel catalyst can be used for efficiently realizing homogeneous polymerization of ethylene, and greatly improving the thermal stability, catalytic activity and polymer molecular weight of the catalyst. In the ethylene polymerization, the catalyst has higher activity, and the polyethylene with different branched high molecular weight is obtained. It is very important that the catalyst effectively realizes the copolymerization of ethylene and methyl acrylate, and the copolymer with different polar monomer insertion rates is obtained. The nickel-based catalyst of the invention has important industrial application value in the field of olefin polymerization.
Description
Technical Field
The invention belongs to the technical field of olefin polymerization, relates to a metal catalyst for catalyzing olefin polymerization, a preparation method thereof and application thereof in catalyzing ethylene homopolymerization, and simultaneously relates to application in ethylene/polar monomer coordination copolymerization.
Background
Polyolefin generally refers to thermoplastic resins such as ethylene, propylene, norbornene and the like, has various advantages of abundant raw materials, low price, good high temperature resistance, easy processing and forming, excellent comprehensive performance and the like, and therefore, the polyolefin material is widely applied to industries such as building materials, electrical elements, household articles, transportation, industrial and agricultural films and the like.
Since the first report in 1995 that nickel diimine and palladium catalysts can be used to produce high molecular weight polyethylene (L. K. Johnson, C. M. Killian, M. Brookhart, New Pd(II)-and Ni(II)-based catalysts for polymerization of ethylene and α-olefins, J. Am. Chem. Soc. 1995, 117, 6414.), these olefin polymerization catalysts were widely studied, these catalysts lack thermal stability, despite their excellent performance, limiting commercial production. At high temperatures, these catalysts rapidly decompose, causing them to lose activity, and the activity in copolymerization is greatly reduced, with a greatly reduced molecular weight.
The catalyst is the core of olefin polymerization, the development of new catalysts is the key to achieving high performance polyolefins, further research has found that catalysts with camphoryl diimine backbone have been shown to polymerize ethylene at temperatures up to 80 ℃, but slowly deactivate during polymerization, long and colleagues (Rhinehart J L , Brown L A , Long B K . A Robust Ni(II) α-Diimine Catalyst for High Temperature Ethylene Polymerization[J]. Journal of the American Chemical Society, 2013, 135(44):16316-9.) reported in 2013 space crowded catalysts that are active at ethylene polymerization temperatures up to 100 ℃ while producing high molecular weight polymers in order to pursue higher thermal stability catalysts. The nickel diimine and palladium catalysts have good effect in catalyzing the copolymerization of ethylene and polar monomers, chenle and other (Zou W, Chen C. Influence of Backbone Substituents on the Ethylene (Co) polymerization Properties of α-diimine Pd (II) and Ni (II) Catalysts[J]. Organometallics, 2016, 35(11): 1794-1801.) are used for synthesizing a series of alpha-diimine ligands with butanedione and acenaphthoquinone skeletons and corresponding palladium and nickel catalysts thereof, and the influence of the catalysts containing electron donating substituents and electron withdrawing substituents on the ligands on the copolymerization and performance of ethylene-methyl acrylate is researched, so that good results are obtained.
Disclosure of Invention
Accordingly, the present invention provides a catalyst containing a large volume of nickel diimine, a preparation method and applications thereof. The catalyst is an alpha-diimine nickel complex with a large-volume acenaphthoquinone skeleton, has high thermal stability and activity in olefin polymerization, and the prepared polymer has ultrahigh molecular weight and low branching degree.
All the raw materials of the present invention are not particularly limited in their sources, and may be purchased on the market or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in purity, and analytical grade is preferably used in the present invention.
The invention contains a large-volume diimine nickel catalyst, which is an alpha-diimine nickel complex with a large-volume acenaphthoquinone skeleton, and the structure is shown as (I):
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy.
The invention also provides a method for preparing the complex of the formula (I), which comprises the following steps:
step (1) synthesis of a compound of formula (II): under nitrogen atmosphere, taking 4-bromophenol and triphenylphosphine, adding a solvent, placing in a low-temperature stirrer, adding 1.2 equivalent of corresponding alcohol and diisopropyl azodicarboxylate, stirring for 5-25 min, then stirring at room temperature overnight, spin-drying the solvent, adding petroleum ether to precipitate out solid, filtering the solid, spin-drying the filtrate, and performing column chromatography to obtain a product, namely a compound (II), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol, isooctanol;
Step (2) synthesis of a compound of formula (iii): under nitrogen atmosphere, dissolving a formula (II) in a solvent, placing the solvent in a low-temperature stirrer, adding n-butyllithium for reaction for 1-2 hours, adding benzaldehyde with para-position substituent for reaction for 1-2 hours, stirring overnight at room temperature, spin-drying the solvent, extracting three times by using CH 2Cl2, drying by using anhydrous magnesium sulfate, filtering magnesium sulfate, spin-drying filtrate, and performing column chromatography to obtain a product, namely a compound (III), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol, isooctanol; r 2 is independent methyl, isopropyl and tert-butyl;
Step (3) synthesizing a compound of formula (IV): 2.5 equivalents of aniline with corresponding substituent groups and formula (III) are taken, heated to 120 ℃, concentrated hydrochloric acid solution of zinc chloride is slowly added, then the temperature is raised to 160 ℃ for reaction for 1-2 hours, the reactant is cooled to room temperature, CH 2Cl2 is used for extraction three times, anhydrous magnesium sulfate is used for drying, magnesium sulfate is filtered, the filtrate is spin-dried, and the product, namely the compound (IV) is obtained by column chromatography chromatographic separation, wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy;
step (4) synthesis of a compound of formula (v): dissolving acenaphthoquinone and zinc chloride in a solvent, stirring at 140 ℃ and adding aniline obtained by a formula (IV), reacting for 3-5 hours, cooling to room temperature, adding methanol to precipitate solid, filtering, washing with methanol, dissolving the solid with the solvent, adding potassium oxalate, stirring at room temperature overnight, extracting with CH 2Cl2 three times, drying with anhydrous magnesium sulfate, filtering to remove magnesium sulfate, concentrating the filtrate, and recrystallizing with methanol to obtain a product, namely a compound (V), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy;
Step (5) synthesis of a complex of formula (I): the compound synthesized in step (4) was reacted with (DME) NiBr 2 in a solvent under nitrogen atmosphere at a ratio of 1:1 equivalent reaction, reaction time is 6-12 hours, and the alpha-diimine nickel complex (VI) of acenaphthoquinone skeleton is synthesized through filtering, washing and drying, wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy; dme=1, 2-dimethoxyethane.
Generally, the solvent in the step (1), the step (2), the step (4) and the step (5) is one or a mixture of a plurality of tetrahydrofuran, acetic acid, dichloromethane, petroleum ether and ethyl acetate.
The invention provides a large-volume alpha-diimine ligand and nickel catalyst, which has the characteristics of larger steric hindrance, effective inhibition of chain transfer, high activity at high temperature, good thermal stability, capability of preparing polyethylene with ultra-high molecular weight, and high activity and insertion rate in copolymerization of ethylene and polar monomers.
(1) Ethylene homo-polymerization
Adding a solvent and a cocatalyst into a 350 mL pressure-resistant bottle under anhydrous and anaerobic conditions, connecting the pressure-resistant bottle to a high-pressure polymerization pipeline, introducing ethylene, injecting a complex dissolved in the solvent through an injector, controlling the pressure of the ethylene to be 1-20 atm, reacting at 0-120 ℃ for 5-30 min, adding an alcohol solution containing hydrochloric acid to quench the reaction after the reaction is finished, filtering, and drying to obtain the polyethylene.
The cocatalyst is MAO, MMAO or AlEt 2 Cl.
The solvent is toluene, n-heptane or dichloromethane; the mass of the substances of the cocatalyst and the complex is 100-500; the alcohol solution containing hydrochloric acid is methanol solution with hydrochloric acid concentration of more than 5wt% or ethanol solution with hydrochloric acid concentration of more than 5 wt%.
(2) Copolymerization of ethylene and polar monomers
Adding solvent and cocatalyst into a 350 mL pressure-resistant bottle under anhydrous and anaerobic conditions, connecting the pressure-resistant bottle to a high-pressure polymerization pipeline, introducing ethylene, injecting a complex dissolved in the solvent through an injector, injecting a polar monomer through the injector, controlling the pressure of the ethylene to be 1-5 atm, reacting at 0-100 ℃ for 1-12 h, quenching the reaction by adding an alcohol solution containing hydrochloric acid, filtering and drying to obtain the copolymer.
The cocatalyst is MAO, MMAO or AlEt 2 Cl.
The solvent is toluene, n-heptane or dichloromethane; the mass of the substances of the cocatalyst and the complex is 100-500; the alcohol solution containing hydrochloric acid is methanol solution with hydrochloric acid concentration of more than 5wt% or ethanol solution with hydrochloric acid concentration of more than 5 wt%.
The polar monomer is one or more of methyl methacrylate, methyl acrylate, 10-undecylenate, 10-undecylen-1-alcohol, allyl trimethoxysilane, allyl chloride, 6-chloro-1-hexene, styrene, allyl benzene, ethyl allyl ether and vinyl diethyl ether.
According to the invention, different substituted ortho-diaryl groups are introduced into a diimine nickel system, a metal nickel center pair is effectively protected by utilizing space effect, and the polymerization capacity of the catalyst is regulated by further utilizing different substituted electronic effects. The synthesized nickel catalyst can be used for efficiently realizing homogeneous polymerization of ethylene, and greatly improving the thermal stability, catalytic activity and polymer molecular weight of the catalyst. In the ethylene polymerization, the catalyst has higher activity, and the polyethylene with different branched high molecular weight is obtained. It is very important that the catalyst effectively realizes the copolymerization of ethylene and methyl acrylate, and the copolymer with different polar monomer insertion rates is obtained. The non-polarity of polyolefin has been an important subject to limit the expansion of its application field. Therefore, the nickel-based catalyst of the invention has important industrial application value in the field of olefin polymerization.
Drawings
FIG. 1 is a nuclear magnetic resonance hydrogen spectrum of a homo-polymer prepared according to an example of the present invention.
FIG. 2 is a nuclear magnetic resonance hydrogen spectrum of a copolymer prepared according to an example of the present invention.
Detailed Description
In order to better understand the technical scheme of the present invention, the present invention will be described in further detail below with reference to examples. It should be understood that these descriptions are merely provided to further illustrate the features and advantages of the present invention and are not intended to limit the scope of the claims.
Example 1
Preparation of Complex formula (1) -1
(Formula (1) -1, i.e., wherein R 1 is isooctyl alcohol, R 2 is tert-butyl, and R 3 is methoxy).
Step 1: under nitrogen atmosphere, 4-bromophenol (0.17 g,1.0 mmol) and triphenylphosphine (0.34 g,1.3 mmol) were taken, added to tetrahydrofuran 40 mL and then placed in a low-temperature stirrer, isooctanol (0.16 g,1.2 mmol) and diisopropyl azodicarboxylate (0.24 g,1.2 mmol) were added, stirred for 15: 15min, then stirred at room temperature overnight, dried tetrahydrofuran, petroleum ether (100 mL) was added to precipitate out a solid, filtered, dried filtrate, and purified by column chromatography (PE/EA=100/1) to give the product (II) (70% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.4 - 7.34 (m, 2H), 6.79 (dd, J = 9.0, 1.2 Hz, 2H), 3.81 (d, J = 5.8 Hz, 2H), 1.73 (dt, J = 12.1, 5.2 Hz, 1H), 1.55 - 1.26 (m, 8H), 0.98 - 0.87 (m, 6H). 13C NMR (100 MHz, CDCl3) δ158.53, 132.17, 116.33, 112.48, 77.37, 77.06, 76.74, 70.75, 39.35, 31.64, 30.51, 29.10, 26.96, 23.85, 23.08, 22.71, 14.17, 14.12, 11.12.
Step 2: dissolving formula (II) (0.29 g,1 mmol) in tetrahydrofuran (50 mL) under nitrogen atmosphere and standing at-78deg.C, adding n-butyllithium (0.48 mL,1.2 mmol) for reaction 2h, adding p-tert-butylbenzaldehyde (0.16 g,1 mmol), continuing to react 1h, stirring overnight at room temperature, spin-drying tetrahydrofuran, extracting three times with CH 2Cl2 (3×30 mL), drying over anhydrous magnesium sulfate, filtering out the magnesium sulfate, spin-drying the filtrate, and subjecting the column chromatography (PE/EA=50/1) to obtain product (III) (75% yield ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.88 - 7.78 (m, 2H), 7.77 - 7.65 (m, 2H), 7.54 - 7.41 (m, 2H), 7.02 - 6.88 (m, 2H), 3.93 (dd, J = 5.7, 1.2 Hz, 2H), 1.82 - 1.72 (m, 1H), 1.57 - 1.24 (m, 18H), 1.01 - 0.83 (m, 7H). 13C NMR (100 MHz, CDCl3) δ 195.30, 162.96, 155.48, 135.58, 132.49, 130.14, 129.83, 125.14, 113.97, 77.41, 77.09, 76.77, 70.69, 53.45, 39.32, 35.05, 31.20, 30.50, 29.09, 23.84, 23.06, 22.73, 14.12, 11.14.
Step 3: taking formula (III) (0.92 g,2.5 mmol) and p-methoxyaniline (0.12 g,1 mmol), heating to 120 ℃, slowly adding a concentrated hydrochloric acid solution of zinc chloride, then heating to 160 ℃ to react 1 h, cooling the reaction to room temperature, extracting three times with CH 2Cl2 (3×30 mL), drying over anhydrous magnesium sulfate, filtering the magnesium sulfate, spin-drying the filtrate, and separating by column chromatography (PE/EA=50/1) to obtain the product (IV) (50% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.28 (d, J = 1.8 Hz, 2H), 7.27 (d, J = 2.0 Hz, 2H), 7.03 - 6.97 (m, 8H), 6.83 - 6.78 (m, 4H), 6.21 (s, 2H), 5.39 (s, 2H), 3.82 - 3.78 (m, 4H), 3.45 (s, 3H), 1.70 (dt, J = 12.2, 5.8 Hz, 2H), 1.36 - 1.25 (m, 31H), 1.00 - 0.84 (m, 15H). 13C NMR (100 MHz, CDCl3) δ158.04, 151.70, 149.20, 139.83, 135.94, 134.43, 131.37, 131.34, 130.95, 130.33, 129.02, 128.86, 127.75, 126.14, 125.30, 114.42, 114.40, 114.06, 77.36, 77.04, 76.73, 70.40, 70.37, 65.60, 55.18, 51.22, 39.44, 34.40, 31.40, 30.55, 29.12, 23.87, 23.08, 19.21, 14.13, 13.77, 11.15, 0.03.
Step 4: acenaphthylquinone (0.18 g,1 mmol), zinc chloride (0.15 g,1.1 mmol), dissolved in acetic acid (10 mL), stirred at 140℃and aniline (1.73 g,2.1 mmol) obtained by formula (IV) was added, after reaction 4 h, cooled to room temperature, methanol (10 mL) was added to precipitate a solid, filtered, washed with methanol (50 mL), the solid was dissolved in dichloromethane, potassium oxalate (0.46 g,2.5 mmol) was added, stirred at room temperature overnight, extracted three times with CH 2Cl2 (3X 30 mL), dried over anhydrous magnesium sulfate, magnesium sulfate was filtered off, the filtrate was concentrated, recrystallized from methanol to give product (V) (45% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.51 - 7.38 (m, 2H), 7.19 - 7.12 (m, 4H), 7.08 - 6.94 (m, 10H), 6.87 - 6.57 (m, 21H), 6.23 - 6.09 (m, 5H), 5.70 - 5.56 (m, 4H), 3.80 - 3.64 (m, 11H), 3.41 (d, J = 27.9 Hz, 3H), 1.76 - 1.62 (m, 3H), 1.42 - 1.27 (m, 36H), 1.24 (d, J = 3.6 Hz, 21H), 0.95 - 0.82 (m, 37H).13C NMR (100 MHz, CDCl3) δ 157.57, 157.07, 155.53, 148.46, 148.00, 142.81, 140.53, 139.84, 130.68, 130.38, 129.32, 129.04, 126.55, 124.96, 124.58, 114.11, 114.03, 113.66, 77.38, 77.06, 76.74, 70.36, 69.97, 55.26, 50.24, 39.36, 34.29, 33.96, 33.88, 31.39, 31.13, 31.08, 30.54, 29.09, 23.83, 23.11, 14.15, 11.23, 11.13, 1.06.
Step 5: compound (v) was reacted with (DME) NiBr 2 in methylene chloride under nitrogen atmosphere at a ratio of 1:1 equivalent of reaction, reaction time 10h, filtration through celite, washing with methylene chloride, drying, and synthesis of acenaphthoquinone skeleton alpha-diimine nickel complex (VI) (80% yield). Elemental analysis C, 75.18, H, 7.81, N, 1.39.
Example 2
Preparation of Complex (1) -2
(Formula (1) -2, i.e., wherein R 1 is 1-hexanol, R 2 is t-butyl, and R 3 is methoxy).
Step 1: under nitrogen atmosphere, 4-bromophenol (0.17 g,1.0 mmol) and triphenylphosphine (0.34 g,1.3 mmol) were taken, added to tetrahydrofuran 40 mL and then placed in a low temperature stirrer, 1-hexanol (0.12 g,1.2 mmol) and diisopropyl azodicarboxylate (0.24 g,1.2 mmol) were added, stirred for 15 min, then stirred at room temperature overnight, dried tetrahydrofuran, petroleum ether (100 mL) was added to precipitate out a solid, filtered, dried filtrate, and chromatographed on column (PE/EA=100/1) to give the product (II) (78% yield ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.44 - 7.32 (m, 2H), 6.84 - 6.68 (m, 2H), 3.91 (t, J = 6.6 Hz, 2H), 1.88 - 1.65 (m, 2H), 1.52 - 1.27 (m, 6H), 1.02 - 0.80 (m, 3H). 13C NMR (100 MHz, CDCl3) δ 158.27, 132.20, 116.30, 112.55, 77.38, 77.06, 76.74, 68.26, 31.60, 29.17, 25.71, 22.63, 14.07.
Step 2: dissolving formula (II) (0.26 g,1 mmol) in tetrahydrofuran (50 mL) under nitrogen atmosphere and standing at-78deg.C, adding n-butyllithium (0.48 mL,1.2 mmol) for reaction 2h, adding p-tert-butylbenzaldehyde (0.16 g,1 mmol), continuing to react 1h, stirring overnight at room temperature, spin-drying tetrahydrofuran, extracting three times with CH 2Cl2 (3×30 mL), drying with anhydrous magnesium sulfate, filtering out magnesium sulfate, spin-drying the filtrate, and subjecting to column chromatography (PE/EA=50/1) to obtain product (III) (73% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.36 - 7.31 (m, 2H), 7.30 - 7.22 (m, 4H), 6.90 - 6.76 (m, 2H), 5.74 (s, 1H), 4.00 - 3.84 (m, 2H), 1.84 - 1.69 (m, 2H), 1.51 - 1.18 (m, 15H), 0.96 - 0.81 (m, 3H). 13C NMR (100 MHz, CDCl3) δ 158.57, 150.30, 141.22, 136.09, 136.07, 127.83, 126.95, 126.21, 125.52, 125.37, 114.41, 77.42, 77.10, 76.79, 75.67, 68.04, 34.53, 31.64, 31.41, 29.29, 25.78, 22.67, 14.11.
Step 3: taking formula (III) (0.85 g,2.5 mmol) and p-methoxyaniline (0.12 g,1 mmol), heating to 120 ℃, slowly adding concentrated hydrochloric acid solution of zinc chloride, then heating to 160 ℃ to react 1 h, cooling the reaction to room temperature, extracting three times with CH 2Cl2 (3×30 mL), drying over anhydrous magnesium sulfate, filtering the magnesium sulfate, spin-drying the filtrate, and separating by column chromatography (PE/EA=50/1) to obtain the product (IV) (55% yield ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.27 (d, J = 2.0 Hz, 2H), 7.25 (s, 2H), 6.99 (d, J = 8.0 Hz, 8H), 6.84 - 6.75 (m, 4H), 6.19 (d, J = 1.1 Hz, 2H), 5.38 (s, 2H), 3.99 - 3.83 (m, 4H), 3.44 (d, J = 0.9 Hz, 3H), 1.82 - 1.68 (m, 4H), 1.49 - 1.12 (m, 32H), 0.90 (d, J = 2.3 Hz, 4H). 13C NMR (100 MHz, CDCl3) δ 157.86, 151.79, 149.24, 139.88, 139.86, 136.02, 134.63, 134.60, 131.42, 131.40, 130.96, 130.43, 129.09, 128.90, 125.34, 125.33, 124.85, 114.46, 114.44, 114.15, 113.97, 111.22, 77.44, 77.13, 76.81, 67.96, 65.60, 55.18, 51.29, 35.51, 34.44, 31.68, 31.46, 30.66, 29.38, 26.99, 26.51, 25.84, 25.68, 22.68, 19.27, 14.12, 13.81.
Step 4: acenaphthylquinone (0.18 g,1 mmol), zinc chloride (0.15 g,1.1 mmol), dissolved in acetic acid (10 mL), stirred at 140℃and aniline (1.61 g,2.1 mmol) obtained by formula (IV) was added, after reaction 4 h, cooled to room temperature, methanol (10 mL) was added to precipitate a solid, filtered, washed with methanol (50 mL), the solid was dissolved in dichloromethane, potassium oxalate (0.46 g,2.5 mmol) was added, stirred at room temperature overnight, extracted three times with CH 2Cl2 (3X 30 mL), dried over anhydrous magnesium sulfate, magnesium sulfate was filtered off, the filtrate was concentrated, recrystallized from methanol to give product (V) (40% yield) ）.1H NMR (400 MHz, CDCl3,ppm) δ 7.55 - 7.39 (m, 2H), 7.21 - 7.09 (m, 5H), 7.08 - 6.92 (m, 9H), 6.90 - 6.63 (m, 18H), 6.58 (ddd, J = 8.3, 4.0, 2.7 Hz, 2H), 6.27 - 6.03 (m, 6H), 5.69 - 5.56 (m, 4H), 3.91 - 3.81 (m, 4H), 3.73 - 3.62 (m, 6H), 3.60 - 3.41 (m, 3H), 3.31 - 3.22 (m, 1H), 1.78 - 1.69 (m, 5H), 1.64 - 1.51 (m, 5H), 1.47 - 1.39 (m, 5H), 1.37 - 1.29 (m, 20H), 1.24 (dt, J = 2.7, 1.4 Hz, 18H), 0.97 (dd, J = 5.4, 2.3 Hz, 7H), 0.91 (ddd, J = 7.7, 3.8, 2.3 Hz, 21H). 13C NMR (100 MHz, CDCl3) δ 164.41, 157.30, 157.27, 156.85, 156.71, 155.51, 148.48, 148.06, 147.99, 142.79, 140.73, 140.45, 135.99, 134.35, 133.52, 130.70, 130.67, 130.39, 130.37, 129.33, 129.26, 129.04, 129.00, 128.36, 127.54, 126.55, 124.97, 124.93, 124.59, 124.54, 114.03, 113.97, 113.67, 113.59, 88.01, 77.26, 77.05, 76.84, 67.89, 67.87, 67.52, 67.41, 55.25, 55.23, 55.20, 50.34, 50.30, 50.23, 50.11, 34.28, 33.94, 33.85, 31.66, 31.64, 31.62, 31.52, 31.37, 31.36, 31.10, 31.03, 30.57, 30.13, 29.71, 29.30, 29.24, 29.22, 25.80, 25.78, 25.77, 22.66, 22.64, 19.20, 14.08.
Step 5: compound (v) was reacted with (DME) NiBr 2 in methylene chloride under nitrogen atmosphere at a ratio of 1:1 equivalent of reaction, reaction time 10h, filtration through celite, washing with methylene chloride, drying, and synthesis of acenaphthoquinone skeleton alpha-diimine nickel complex (VI) (85% yield). Elemental analysis (for example), C, 74.56, H, 7.42, N, 1.47.
Example 3
Preparation of Complex (1) -3
(Formulas (1) -3), i.e., wherein R 1 is ethanol, R 2 is tert-butyl, and R 3 is methoxy).
Step 1: under nitrogen atmosphere, 4-bromophenol (0.17 g,1.0 mmol) and triphenylphosphine (0.34 g,1.3 mmol) were taken, added to tetrahydrofuran 40 mL and then placed in a low-temperature stirrer, ethanol (0.06 g,1.2 mmol) and diisopropyl azodicarboxylate (0.24 g,1.2 mmol) were added, stirred for 15min, then stirred at room temperature overnight, dried tetrahydrofuran, petroleum ether (100 mL) was added to precipitate a solid, filtered, dried filtrate, and chromatographed on column (PE/EA=100/1) to give product (II) (75% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.43 - 7.30 (m, 2H), 6.77 (dd, J = 8.5, 1.3 Hz, 2H), 4.06 - 3.92 (m, 2H), 1.48 - 1.36 (m, 3H). 13C NMR (100 MHz, CDCl3) δ 158.14, 137.35, 137.25, 133.91, 133.72, 132.26, 128.81, 128.63, 128.56, 116.32, 112.65, 77.56, 77.24, 76.92, 63.68, 14.84.
Step 2: dissolving formula (II) (0.20 g,1 mmol) in tetrahydrofuran (50 mL) under nitrogen atmosphere and standing at-78deg.C, adding n-butyllithium (0.48 mL,1.2 mmol) for reaction 2h, adding p-tert-butylbenzaldehyde (0.16 g,1 mmol), continuing to react 1h, stirring overnight at room temperature, spin-drying tetrahydrofuran, extracting three times with CH 2Cl2 (3×30 mL), drying over anhydrous magnesium sulfate, filtering out magnesium sulfate, spin-drying the filtrate, and subjecting to column chromatography (PE/EA=50/1) to obtain product (III) (74% yield ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.39 - 7.30 (m, 2H), 7.29 - 7.20 (m, 4H), 6.85 - 6.80 (m, 2H), 5.72 (s, 1H), 3.98 (q, J = 7.0 Hz, 2H), 1.41 - 1.24 (m, 12H). 13C NMR (100 MHz, CDCl3) δ 158.40, 158.33, 150.49, 150.18, 150.07, 141.43, 139.66, 138.16, 136.45, 135.72, 134.48, 128.90, 128.74, 128.65, 128.01, 127.76, 127.10, 127.02, 126.95, 126.40, 125.45, 125.35, 114.45, 81.96, 79.36, 77.64, 77.32, 77.00, 75.56, 70.27, 64.81, 63.51, 34.63, 34.59, 31.55, 14.98.
Step 3: taking formula (III) (0.71 g,2.5 mmol) and p-methoxyaniline (0.12 g,1 mmol), heating to 120 ℃, slowly adding a concentrated hydrochloric acid solution of zinc chloride, then heating to 160 ℃ to react 1h, cooling the reaction to room temperature, extracting three times with CH 2Cl2 (3×30 mL), drying over anhydrous magnesium sulfate, filtering the magnesium sulfate, spin-drying the filtrate, and separating by column chromatography (PE/EA=50/1) to obtain the product (IV) (53% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.30 - 7.23 (m, 5H), 7.03 - 6.97 (m, 7H), 6.82 - 6.77 (m, 4H), 6.19 (d, J = 1.8 Hz, 2H), 5.38 (s, 2H), 4.03 - 3.94 (m, 4H), 3.44 (d, J = 1.2 Hz, 3H), 1.44 - 1.36 (m, 6H), 1.29 (d, J = 1.1 Hz, 19H). 13C NMR (100 MHz, CDCl3)δ 157.61, 151.77, 149.24, 139.76, 135.92, 134.69, 134.65, 131.39, 130.40, 129.03, 125.29, 114.40, 114.11, 77.35, 77.03, 76.72, 63.35, 55.17, 51.22, 34.40, 31.39, 14.90.
Step 4: acenaphthylquinone (0.18 g,1 mmol), zinc chloride (0.15 g,1.1 mmol), dissolved in acetic acid (10 mL), stirred at 140℃and aniline (1.38 g,2.1 mmol) obtained by formula (IV) was added, after reaction 4 h, cooled to room temperature, methanol (10 mL) was added to precipitate a solid, filtered, washed with methanol (50 mL), the solid was dissolved in dichloromethane, potassium oxalate (0.46 g,2.5 mmol) was added, stirred at room temperature overnight, extracted three times with CH 2Cl2 (3X 30 mL), dried over anhydrous magnesium sulfate, magnesium sulfate was filtered off, the filtrate was concentrated, recrystallized from methanol to give product (V) (38% yield) ）.1H NMR (400 MHz, CDCl3, ppm) δ 7.56 - 7.40 (m, 2H), 7.22 - 7.10 (m, 4H), 7.08 - 6.48 (m, 29H), 6.34 - 5.92 (m, 7H), 5.71 - 5.52 (m, 4H), 3.94 (q, J = 8.0, 7.5 Hz, 4H), 3.72 - 3.33 (m, 10H), 1.36 (t, J = 6.9 Hz, 6H), 1.29 - 1.16 (m, 42H). 13C NMR (100 MHz, CDCl3) δ 155.62, 148.52, 130.72, 130.42, 129.28, 129.03, 124.98, 124.55, 114.04, 113.75, 63.30, 55.25, 50.35, 34.28, 33.85, 31.94, 31.64, 31.38, 31.11, 31.02, 14.91, 14.76, 14.13.
Step 5: compound (v) was reacted with (DME) NiBr 2 in methylene chloride under nitrogen atmosphere at a ratio of 1:1 equivalent of reaction, reaction time 10h, filtration through celite, washing with methylene chloride, drying, and synthesis of acenaphthoquinone skeleton alpha-diimine nickel complex (VI) (85% yield). Elemental analysis C, 73.08, H, 6.19, N, 1.67.
Application example 1
Use of catalytic ethylene polymerization
Adding a stirring magnet, 20mL of n-heptane and a cocatalyst Et 2 AlCl into a 350 mL pressure bottle under anhydrous and anaerobic conditions, connecting the pressure bottle to a high-pressure polymerization pipeline, introducing ethylene, then injecting a complex (1 mu mol,2 mL) dissolved in methylene dichloride through a syringe, controlling the ethylene pressure to 8 atm, reacting at a temperature for 10 minutes, adding an ethanolic acid solution containing 5% of ethanol at the end of the reaction to precipitate out a solid, washing the solid with pure ethanol for three times, and drying in a vacuum oven for 24 hours to constant weight to obtain polyethylene.
Application example 2
Application of catalyzing ethylene and methyl acrylate copolymerization
A stirring magnet, 20mL n-heptane and a cocatalyst Et 2 AlCl were added into a 350 mL pressure flask under anhydrous and anaerobic conditions, methyl acrylate was added, the methyl acrylate concentration was 0.5mol/L, the pressure flask was connected to a high pressure polymerization line and ethylene was introduced, then a complex (10. Mu. Mol,2 mL) dissolved in methylene chloride was injected by a syringe, the ethylene pressure was controlled to 1 atm, the reaction temperature was controlled for 2 hours, an ethanol acid solution containing 5% of ethanol was added at the end of the reaction to precipitate a solid, the solid was washed three times with pure ethanol, and dried in a vacuum oven for 24 hours to constant weight, to obtain a copolymer.
Table 1 below shows the ethylene polymerization experimental conditions provided by the present invention; polymerization result data such as catalyst (cat.), temperature (T), yield (Yield), catalytic activity (act.), polymer molecular weight (M n), polymer molecular weight distribution (PDI), and branching degree (B).
Table 2 below shows the experimental conditions for the copolymerization of ethylene and methyl acrylate provided by the present invention; polymerization result data such as catalyst (cat.), temperature (T), methyl acrylate concentration (M), yield (Yield), catalytic activity (act.), polymer molecular weight (M n), polymer molecular weight distribution (PDI), and branching degree (B).
TABLE 1 polymerization of ethylene a
a Polymerization conditions: catalyst 1 μmol, dichloromethane=2 mL, [ Al ]/[ Ni ] =500, n-heptane=20 mL, ethylene pressure 8 atm, time=10 minutes;
b The unit of active act is 10 6 g mol-1 h-1;
c The polymer molecular weight M n and the molecular weight distribution PDI were determined by Gel Permeation Chromatography (GPC) at 150 ℃ in trichlorobenzene and polystyrene standards;
d The degree of branching refers to the number of branches per 1000 carbon atoms, as determined by 1 H NMR;
e Melting point T m was determined by Differential Scanning Calorimetry (DSC).
TABLE 2 copolymerization of ethylene with methyl acrylate a
a Polymerization conditions: catalyst 10 μmol, dichloromethane=2 mL, [ Al ]/[ Ni ] =500, n-heptane=20 mL, methyl acrylate=0.5 mol/L, time=2 hours;
b The unit of active act is 10 4 g mol-1 h-1;
c The polymer molecular weight M n and the molecular weight distribution PDI were determined by Gel Permeation Chromatography (GPC) at 150 ℃ in trichlorobenzene and polystyrene standards;
d The polar monomer insertion ratio X m was determined by 1 H NMR;
e Melting point T m was determined by Differential Scanning Calorimetry (DSC).
The above description is provided for the detailed description of a compound, a complex catalyst, a catalyst composition and a method for preparing an olefin polymer, and specific examples are used herein to illustrate the principles and embodiments of the present invention, but the present invention is not limited to the specific embodiments described herein. Those skilled in the art will appreciate that other changes and modifications may be made without departing from the scope of the invention, and such changes and modifications are intended to fall within the scope of the appended claims.
Claims (10)
1. A catalyst containing large-volume diimine nickel is characterized in that the catalyst is an alpha-diimine nickel complex with a large-volume acenaphthoquinone skeleton, and the structure of the complex is shown as the formula (I):
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy.
2. A process for preparing a catalyst comprising bulk nickel diimine according to claim 1, wherein: the preparation method of the complex comprises the following steps:
step (1) synthesis of a compound of formula (II): under nitrogen atmosphere, taking 4-bromophenol and triphenylphosphine, adding a solvent, placing in a low-temperature stirrer, adding 1.2 equivalent of corresponding alcohol and diisopropyl azodicarboxylate, stirring for 5-25 min, then stirring at room temperature overnight, spin-drying the solvent, adding petroleum ether to precipitate out solid, filtering the solid, spin-drying the filtrate, and performing column chromatography to obtain a product, namely a compound (II), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol, isooctanol;
Step (2) synthesis of a compound of formula (iii): under nitrogen atmosphere, dissolving a formula (II) in a solvent, placing the solvent in a low-temperature stirrer, adding n-butyllithium for reaction for 1-2 hours, adding benzaldehyde with para-position substituent for reaction for 1-2 hours, stirring overnight at room temperature, spin-drying the solvent, extracting three times by using CH 2Cl2, drying by using anhydrous magnesium sulfate, filtering magnesium sulfate, spin-drying filtrate, and performing column chromatography to obtain a product, namely a compound (III), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol, isooctanol; r 2 is independent methyl, isopropyl and tert-butyl;
Step (3) synthesizing a compound of formula (IV): 2.5 equivalents of aniline with corresponding substituent groups and formula (III) are taken, heated to 120 ℃, concentrated hydrochloric acid solution of zinc chloride is slowly added, then the temperature is raised to 160 ℃ for reaction for 1-2 hours, the reactant is cooled to room temperature, CH 2Cl2 is used for extraction three times, anhydrous magnesium sulfate is used for drying, magnesium sulfate is filtered, the filtrate is spin-dried, and the product, namely the compound (IV) is obtained by column chromatography chromatographic separation, wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy;
step (4) synthesis of a compound of formula (v): dissolving acenaphthoquinone and zinc chloride in a solvent, stirring at 140 ℃ and adding aniline obtained by a formula (IV), reacting for 3-5 hours, cooling to room temperature, adding methanol to precipitate solid, filtering, washing with methanol, dissolving the solid with the solvent, adding potassium oxalate, stirring at room temperature overnight, extracting with CH 2Cl2 three times, drying with anhydrous magnesium sulfate, filtering to remove magnesium sulfate, concentrating the filtrate, and recrystallizing with methanol to obtain a product, namely a compound (V), wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy;
Step (5) synthesis of a complex of formula (I): the compound synthesized in step (4) was reacted with (DME) NiBr 2 in a solvent under nitrogen atmosphere at a ratio of 1:1 equivalent reaction, reaction time is 6-12 hours, and the alpha-diimine nickel complex (VI) of acenaphthoquinone skeleton is synthesized through filtering, washing and drying, wherein the reaction formula is as follows:
Wherein R 1 is independent methanol, ethanol, 1-hexanol or isooctanol; r 2 is independent methyl, isopropyl and tert-butyl; r 3 is independent hydrogen, methyl and methoxy; dme=1, 2-dimethoxyethane.
3. The process for preparing a catalyst comprising a bulky nickel diimine according to claim 2, wherein: the solvent in the step (1), the step (2), the step (4) and the step (5) is one or a mixture of more of tetrahydrofuran, acetic acid, methylene dichloride, petroleum ether and ethyl acetate.
4. Use of a catalyst containing bulky nickel diimine according to claim 1, characterized in that: the complex and the cocatalyst form a catalytic system for catalyzing ethylene polymerization to prepare high molecular weight polyethylene or catalyzing ethylene and polar monomer copolymerization.
5. The use of a catalyst comprising a bulky nickel diimine according to claim 4, wherein: use in the catalytic preparation of high molecular weight polyethylene from ethylene: adding a solvent and a cocatalyst into a 350 mL pressure-resistant bottle under anhydrous and anaerobic conditions, connecting the pressure-resistant bottle to a high-pressure polymerization pipeline, introducing ethylene, injecting a complex dissolved in the solvent through an injector, controlling the pressure of the ethylene to be 1-20 atm, reacting at 0-120 ℃ for 5-30 min, adding an alcohol solution containing hydrochloric acid to quench the reaction after the reaction is finished, filtering, and drying to obtain the polyethylene.
6. The use of a catalyst comprising a bulky nickel diimine according to claim 5, wherein: the solvent is toluene, n-heptane or dichloromethane; the mass of the substances of the cocatalyst and the complex is 100-500; the alcohol solution containing hydrochloric acid is methanol solution with hydrochloric acid concentration of more than 5 wt% or ethanol solution with hydrochloric acid concentration of more than 5 wt%.
7. The use of a catalyst comprising a bulky nickel diimine according to claim 4, wherein: use in catalyzing the copolymerization of ethylene with polar monomers: adding solvent and cocatalyst into a 350 mL pressure-resistant bottle under anhydrous and anaerobic conditions, connecting the pressure-resistant bottle to a high-pressure polymerization pipeline, introducing ethylene, injecting a complex dissolved in the solvent through an injector, injecting a polar monomer through the injector, controlling the pressure of the ethylene to be 1-5 atm, reacting at 0-100 ℃ for 1-12 h, quenching the reaction by adding an alcohol solution containing hydrochloric acid, filtering and drying to obtain the copolymer.
8. The use of a catalyst comprising a bulky nickel diimine according to claim 7, wherein: the solvent is toluene, n-heptane or dichloromethane; the mass of the substances of the cocatalyst and the complex is 100-500; the alcohol solution containing hydrochloric acid is methanol solution with hydrochloric acid concentration of more than 5 wt% or ethanol solution with hydrochloric acid concentration of more than 5 wt%.
9. The use of a catalyst comprising a bulky nickel diimine according to claim 7, wherein: the polar monomer is one or more of methyl methacrylate, methyl acrylate, 10-undecylenate, 10-undecylen-1-alcohol, allyl trimethoxysilane, allyl chloride, 6-chloro-1-hexene, styrene, allyl benzene, ethyl allyl ether and vinyl diethyl ether.
10. Use of a catalyst containing bulky nickel diimine according to one of the claims 4-8, characterized in that: the cocatalyst is MAO, MMAO or AlEt 2 Cl.
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